﻿package net.sapfree.core.code;

public class JavaScriptEscape {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
  
	    String stest = "1234 abcd[]()<+>,.~\\";    
		    System.out.println(stest);    
		    System.out.println(escape(stest));    
		    System.out.println(unescape(escape(stest)));    
	    }    

		private final static String[] hex = { "00", "01", "02", "03", "04", "05",    
		"06", "07", "08", "09", "0A", "0B", "0C", "0D", "0E", "0F", "10",    
		"11", "12", "13", "14", "15", "16", "17", "18", "19", "1A", "1B",    
		"1C", "1D", "1E", "1F", "20", "21", "22", "23", "24", "25", "26",    
		"27", "28", "29", "2A", "2B", "2C", "2D", "2E", "2F", "30", "31",    
		"32", "33", "34", "35", "36", "37", "38", "39", "3A", "3B", "3C",    
		"3D", "3E", "3F", "40", "41", "42", "43", "44", "45", "46", "47",    
		"48", "49", "4A", "4B", "4C", "4D", "4E", "4F", "50", "51", "52",    
		"53", "54", "55", "56", "57", "58", "59", "5A", "5B", "5C", "5D",    
		"5E", "5F", "60", "61", "62", "63", "64", "65", "66", "67", "68",    
		"69", "6A", "6B", "6C", "6D", "6E", "6F", "70", "71", "72", "73",    
		"74", "75", "76", "77", "78", "79", "7A", "7B", "7C", "7D", "7E",    
		"7F", "80", "81", "82", "83", "84", "85", "86", "87", "88", "89",    
		"8A", "8B", "8C", "8D", "8E", "8F", "90", "91", "92", "93", "94",    
		"95", "96", "97", "98", "99", "9A", "9B", "9C", "9D", "9E", "9F",    
		"A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7", "A8", "A9", "AA",    
		"AB", "AC", "AD", "AE", "AF", "B0", "B1", "B2", "B3", "B4", "B5",    
		"B6", "B7", "B8", "B9", "BA", "BB", "BC", "BD", "BE", "BF", "C0",    
		"C1", "C2", "C3", "C4", "C5", "C6", "C7", "C8", "C9", "CA", "CB",    
		"CC", "CD", "CE", "CF", "D0", "D1", "D2", "D3", "D4", "D5", "D6",    
		"D7", "D8", "D9", "DA", "DB", "DC", "DD", "DE", "DF", "E0", "E1",    
		"E2", "E3", "E4", "E5", "E6", "E7", "E8", "E9", "EA", "EB", "EC",    
		"ED", "EE", "EF", "F0", "F1", "F2", "F3", "F4", "F5", "F6", "F7",    
		"F8", "F9", "FA", "FB", "FC", "FD", "FE", "FF" };    
		   
	    private final static byte[] val = { 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x00, 0x01,    
	    0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,    
	    0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F };    
	   
	    /** *//**   
	     * 编码 
	     *    
	     * @param s   
	     * @return   
	     */   
	    public static String escape(String s){    
		    StringBuffer sbuf = new StringBuffer();    
		    int len = s.length();    
		    for (int i = 0; i < len; i++){    
			    int ch = s.charAt(i);    
			    if ('A' <= ch && ch <= 'Z'){    
			    	sbuf.append((char) ch);    
			    } else if ('a' <= ch && ch <= 'z'){    
			    	sbuf.append((char) ch);    
			    } else if ('0' <= ch && ch <= '9'){           
			    	sbuf.append((char) ch);    
			    } else if (ch == '-' || ch == '_' || ch == '.' || ch == '!' || ch == '~' || ch == '*' || ch == '\'' || ch == '(' || ch == ')'){    
			    	sbuf.append((char) ch);    
			    } else if (ch <= 0x007F){    
				    sbuf.append('%');    
				    sbuf.append(hex[ch]);    
			    } else{    
				    sbuf.append('%');    
				    sbuf.append('u');    
				    sbuf.append(hex[(ch >>> 8)]);    
				    sbuf.append(hex[(0x00FF & ch)]);    
			    }
		    }
		    return sbuf.toString();    
	    }
	   
	    /**
	     * 解码 说明：本方法保证 不论参数s是否经过escape()编码，均能得到正确的“解码”结果 
	     *    
	     * @param s   
	     * @return   
	     */   
	    public static String unescape(String s){    
		    StringBuffer sbuf = new StringBuffer();    
		    int i = 0;    
		    int len = s.length();    
		    while (i < len){    
			    int ch = s.charAt(i);    
			    if ('A' <= ch && ch <= 'Z'){    
			    	sbuf.append((char) ch);    
			    } else if ('a' <= ch && ch <= 'z'){     
			    	sbuf.append((char) ch);    
			    } else if ('0' <= ch && ch <= '9'){ 
			    	sbuf.append((char) ch);    
			    } else if (ch == '-' || ch == '_'|| ch == '.' || ch == '!' || ch == '~' || ch == '*'|| ch == '\'' || ch == '(' || ch == ')'){    
			    	sbuf.append((char) ch);    
			    } else if (ch == '%'){
				    int cint = 0;    
				    if ('u' != s.charAt(i + 1)){    
					    cint = (cint << 4) | val[s.charAt(i + 1)];    
					    cint = (cint << 4) | val[s.charAt(i + 2)];    
					    i += 2;    
				    } else{    
					    cint = (cint << 4) | val[s.charAt(i + 2)];    
					    cint = (cint << 4) | val[s.charAt(i + 3)];    
					    cint = (cint << 4) | val[s.charAt(i + 4)];    
					    cint = (cint << 4) | val[s.charAt(i + 5)];    
					    i += 5;    
				    }
				    sbuf.append((char) cint);    
			    } else{    
			    	sbuf.append((char) ch);    
			    }
			    i++;
		    }
		    return sbuf.toString();    
	    }
}
